HÄHKIÖNIEMI, Markus; LEPPÄAHO, Henry; FRANCISCO, John. Teacher-assisted open problem solving. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 18, n. 2, p. 47–69, 2013. DOI: 10.7146/nomad.v18i2.148503. Disponível em: https://tidsskrift.dk/NOMAD/article/view/148503. Acesso em: 6 dec. 2025.